:root {
  --bg: #f3f6fc;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6b6b70;
  --border: #e6e6e3;
  --accent: #1f4fd8;
  --accent-hover: #c8102e; /* DTU red */
  --accent-soft: #e6ecfb;
  --glow-1: #e3ebff;
  --glow-2: #fdeef0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --surface: #1a1a1d;
    --text: #ececef;
    --muted: #9a9aa2;
    --border: #2b2b30;
    --accent: #7ea2ff;
    --accent-hover: #ff7a8a;
    --accent-soft: #1f2433;
    --glow-1: #182033;
    --glow-2: #2a1a20;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

/* Offset anchored sections so headings clear the sticky top bar */
#publications, #services { scroll-margin-top: 56px; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 10% -10%, var(--glow-1), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, var(--glow-2), transparent 60%);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover, a:focus { color: var(--accent-hover); }

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 72px 24px 40px;
}

/* ---------- Hero ---------- */
.hero {
  display: flex;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}
.hero-text { flex: 1; min-width: 0; }

h1 {
  margin: 0;
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.role {
  margin: 6px 0 22px;
  color: var(--muted);
  font-weight: 500;
}
.hero-text p { margin: 0 0 14px; }

.hero-photo img {
  display: block;
  width: 200px;
  height: 200px;
  object-fit: cover;
  object-position: center 75%;
  border-radius: 50%;
  border: 4px solid var(--surface);
  box-shadow: 0 8px 28px rgba(0, 0, 0, .12);
}

/* ---------- Sticky top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  margin: 0;
  padding: 7px 32px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.topbar-links { display: flex; flex-wrap: wrap; gap: 8px; }
.topbar-links a {
  padding: 3px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--accent);
  transition: border-color .15s ease, color .15s ease, transform .15s ease;
}
.topbar-links a:hover {
  border-color: var(--accent-hover);
  color: var(--accent-hover);
  transform: translateY(-1px);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.links a {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 14px;
  font-weight: 500;
  transition: border-color .15s ease, color .15s ease, transform .15s ease;
}
.links a:hover {
  border-color: var(--accent-hover);
  transform: translateY(-1px);
}

/* Single Email button that opens a small menu with both addresses */
.links > a, .email-menu summary {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 14px;
  font-weight: 500;
}
.email-menu { position: relative; }
.email-menu summary {
  list-style: none;
  cursor: pointer;
  color: var(--accent);
  transition: border-color .15s ease, color .15s ease;
}
.email-menu summary::-webkit-details-marker { display: none; }
.email-menu summary:hover,
.email-menu[open] summary { border-color: var(--accent-hover); color: var(--accent-hover); }
.email-options {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  min-width: max-content;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .1);
}
.links .email-options a {
  padding: 6px 10px;
  border: 0;
  border-radius: 8px;
  background: none;
  font-size: 14px;
  text-align: left;
}
.links .email-options a:hover { background: var(--accent-soft); transform: none; }

/* ---------- Sections ---------- */
h2 {
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* ---------- Subsections & service lists ---------- */
.subsection {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.service-list {
  margin: 0 0 24px;
  padding-left: 20px;
}
.service-list li { margin: 0 0 6px; font-size: 15px; }
.service-list > :last-child { margin-bottom: 0; }

/* ---------- Papers ---------- */
.paper {
  display: flex;
  gap: 28px;
  align-items: stretch;
  padding: 20px;
  margin: 0 -20px 8px;
  border-radius: 14px;
  transition: background .2s ease;
}
.paper:hover { background: var(--surface); box-shadow: 0 2px 14px rgba(0, 0, 0, .05); }

/* Box is as tall as the text beside it; the image sits centered inside with breathing room */
.paper-media {
  flex: 0 0 300px;
  width: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .06);
}
.paper-media img {
  display: block;
  max-width: 100%;
  height: auto;
}

.paper-body { flex: 1; min-width: 0; }
.paper-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}
.authors, .venue, .summary { margin: 0 0 4px; font-size: 15px; }
.authors strong { font-weight: 600; }
.venue { color: var(--muted); font-style: italic; font-size: 13px; }
.muted { color: var(--muted); }
.summary { margin-top: 10px; color: var(--muted); }
.paper-body > :last-child { margin-bottom: 0; }

.paper-links { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.paper-links a {
  padding: 2px 10px;
  border-radius: 6px;
  background: var(--accent-soft);
  font-size: 13px;
  font-weight: 500;
}

/* ---------- Footer ---------- */
footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* ---------- Mobile ---------- */
@media (max-width: 680px) {
  .page { padding: 40px 16px 32px; }
  .hero { flex-direction: column-reverse; gap: 24px; text-align: center; margin-bottom: 48px; }
  .hero-text p { text-align: left; }
  .links { justify-content: center; }
  .topbar-inner { padding: 6px 16px; }
  .hero-photo img { width: 160px; height: 160px; }
  h1 { font-size: 32px; }
  .paper { flex-direction: column; align-items: stretch; gap: 14px; margin: 0 0 8px; padding: 12px 0; }
  .paper:hover { background: none; box-shadow: none; }
  .paper-media { width: 100%; flex-basis: auto; }
}